Yes, you have to wait a while until they are older. Once you get the hang of it you can sex them quite young, but right now it may take 5-12 weeks to find out genders.
Goodluck, and you can always post pics to have people help you sex them

will get some pics up soon I HATE THIS PART waiting to see whats what, going to pick up another 20 EE pullets (I hope) might come home with some cuckoo marans if they come in so i will (hopefully) have my fill for chicks for the year